From Destinypedia, the Destiny wiki
Servile Ogres are ogres that are created for the sole purpose for protecting the Ogre-controlling Taken Wizard known as Kagoor. One can be seen in the Court of Oryx alongside its creator.
The Servile Ogre, when summoned, immediately begins to attack any enemy it sees with a powerful eye blast. It never leaves the top area of the Court of Oryx, always staying near its creator. The Servile Ogre has far more health than most Ogres, however its slow speed and large figure allows critical hits to be easily landed on it. Upon its destruction Kagoor becomes vulnerable.